A novel multilayer high temperature colored solar absorber coating based on high-entropy alloy MoNbHfZrTi: Optimized preparation and chromaticity investigation

Guo, Huixia; He, Cheng‐Yu; Qiu, Xiao‐Yang; Shen, Y.F.; Liu, Gang; Gao, Xiang‐Hu

doi:10.1016/j.solmat.2020.110444

Cited by 47 publications

(25 citation statements)

References 33 publications

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“…[ 203–209 ] Based on the reactive radio frequency magnetron sputtering, the MoNbHfZrTiN and MoNbHfZrTiON HEA films are obtained, which exhibits an excellent solar spectral selectivity and is applied to solar thermal absorption coatings. [ 210 ] The other physical property, such as hydrogen storage behavior, has been reported. [ 211–213 ] This property plays a key role in potential functional applications.…”

Section: Propertiesmentioning

confidence: 99%

Microstructures and Properties of High‐Entropy Materials: Modeling, Simulation, and Experiments

Fang

Liaw

2020

Adv Eng Mater

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The performances of high‐entropy materials (HEMs), including high‐entropy alloys, high‐entropy ceramics, and high‐entropy polymers, with unique characteristics (high mixing entropy, serious lattice distortion, and short‐range order) determined by experiments are out of the ordinary, such as the excellent mechanical properties. The important research methods on HEMs are briefly introduced from the physical modeling, multiscale simulation, and experiments at various scales. The microstructures (dislocation, twinning, grain boundary, and phase) and performances (mechanical property, physical property, chemical property, optical property, medical property, and irradiation property) are summarized. Future directions of research and development with a focus on modeling and simulation in HEMs are discussed. In the next, HEMs with the unique properties would be promising candidates for industrial applications beyond conventional alloys.

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Section: Propertiesmentioning

confidence: 99%

Microstructures and Properties of High‐Entropy Materials: Modeling, Simulation, and Experiments

Fang

Liaw

2020

Adv Eng Mater

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“…In our previous works, a refractory HEA MoNbHfZrTi target was used to prepare a novel Al/MoNbHfZrTiN/MoNbHfZrTiON/SiO 2 SSAC, which exhibits good optical properties (α/ε = 93.5%/9%, at 82 °C). [ 25 ] Subsequently, the oxidation of the IR reflectance layer of Al was proved to be responsible for the loss of efficacy of the coating mentioned earlier. [ 26 ] It has been reported that doping Al, Cr, and Si elements onto refractory HEAs contributes to oxidation resistance at elevated temperatures owing to the formation of oxide thin films that provide a barrier and resist further oxidation.…”

Section: Introductionmentioning

confidence: 99%

Scalable and Ultrathin High‐Temperature Solar Selective Absorbing Coatings Based on the High‐Entropy Nanoceramic AlCrWTaNbTiN with High Photothermal Conversion Efficiency

Gao

Qiu

et al. 2021

Solar RRL

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High‐entropy ceramics, especially high‐entropy alloy nitrides (HEANs), have attracted increasing attention in recent years due to their unique structural characteristics that result in their potential use in correlated high‐temperature structural materials. However, research on their optical properties, especially the spectral selectivity, is still in its infancy. According to Carnot efficiency, which demands an extremely high working temperature to elevate the performance of a concentrating solar power (CSP) system, excellent thermal stability is valuable to meet the requirements of solar selective absorbing coatings (SSACs). Herein, the high‐entropy ceramic AlCrWTaNbTiN is introduced as effective absorption layers by adjusting the nitrogen content to design and fabricate an ultrathin multilayer solar absorbing coating, which exhibits a high solar absorptance of 93% and a low emittance of 6.8% at 82 °C. Coating design (CODE) software is used to design and optimize the multilayer solar absorbing coating. Moreover, the optical properties, microstructure, thermal stability, and failure mechanism are investigated. Finite‐difference time‐domain (FDTD) calculations are used to understand the nature of the optical absorption consisting of intrinsic absorption and extinction absorption.

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“…The core component in a solar thermal collector is the Selective Solar Absorber (SSA). The idea was first introduced at the end of '50, and since then, several works have been devoted to study and to optimize SSA [9][10][11][12][13][14][15][16][17][18][19][20][21][22]. The ideal SSA should efficiently absorb solar radiation (solar absorptance α=1), whereas its thermal emission should be minimal (emissivity =0).…”

Section: Introductionmentioning

confidence: 99%

“…They have been periodically summarized in review papers [10,11,23,24,27,28]. Also very recent works developing new idea in SSA such as 3D structured graphene [21], multi-layered cermet [13], nanomultilayer [29] or high entropy alloy [9] use λ cut-off as defined in [10].…”

Section: Introductionmentioning

confidence: 99%

“…In this work a multilayer absorber consisting of Cr 2 O 3 /Ti/Cr 2 O 3 on smooth Aluminium substrate has been numerically investigated. Multilayer absorbers allow to control thermal emission while guaranteeing high solar absorption, excellent thermal stability and their optical properties can be easily simulated [9,12,14,20,35,36]. A single SiO 2 layer has been used as antireflective coating to improve absorptance.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Efficiency of Selective Solar Absorber in High Vacuum Flat Solar Thermal Panels: The Role of Emissivity and Cut-Off Wavelength

Maio¹,

D’Alessandro²,

Caldarelli³

et al. 2020

Preprint

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A multilayer structure on a metallic substrate has been optically simulated and the optimization procedure aimed at obtaining Selective Solar Absorber (SSA) is discussed. This study refers to flat high vacuum thermal collectors and the overall Sun-to-thermal conversion efficiency has been evaluated using analytical formula and numerical thermal model. Both methods are in agreement and they have been validated using experimental results on a commercial absorber. The importance of a low emittance value to obtain high thermal efficiency at high temperatures and high stagnation temperature in selective solar absorber is highlighted. Optimized absorbers can be 8% more efficient than the commercial alternative at 250 °C operating temperatures and up to 27% more efficient at 300 °C. A stagnation temperature higher than 400 °C can be reached without Sun concentration if the proper design is adopted.

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A novel multilayer high temperature colored solar absorber coating based on high-entropy alloy MoNbHfZrTi: Optimized preparation and chromaticity investigation

Cited by 47 publications

References 33 publications

Microstructures and Properties of High‐Entropy Materials: Modeling, Simulation, and Experiments

Microstructures and Properties of High‐Entropy Materials: Modeling, Simulation, and Experiments

Scalable and Ultrathin High‐Temperature Solar Selective Absorbing Coatings Based on the High‐Entropy Nanoceramic AlCrWTaNbTiN with High Photothermal Conversion Efficiency

Efficiency of Selective Solar Absorber in High Vacuum Flat Solar Thermal Panels: The Role of Emissivity and Cut-Off Wavelength

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